Searches took place at two places in Birmingham and a residential dimension in the Radford and Arboretum area of Nottingham.

A woman who watched police arriving to examine the Nottingham property told the BBC the raid took place between about 15:00 and 16:00 BST. She said other detectives in plain invests remained at the background for a few hours.

Sham Khatun said: “A van parked up outside the members of this house, they broke into the house. They wailed ‘Police! ‘, they separated a couple of doors.”

Suspect ‘not co-operating’

Scotland Yard’s head of dealing with terrorism Neil Basu said: “Given that this appears to be a deliberate behave, the methodology used and this being an iconic place, the administration is considering it as a terrorist incident.”

The assistant commissioner added there was “no intelligence at this time of further danger” to London or the UK as a whole.

Westminster vehicle clang treated as terrorist attackWhat we know so farWestminster crash in scenesImage caption A residential belonging in Nottingham( interpreted on the left of this draw) was raided by police in matters relating to the investigations Media captionArmed police answered after a vehicle crashed into insurance hindrances Image caption Exclusively the area around the scene of the accident remains sealed off Image caption Cyclists were accompanied on the floor after the gate-crash Media captionWitness: “I understood a humankind drive towards Parliament at speed”